Cake of soap



FIG. 1 is a perspective view;

FIG. 2 is a front view;

FIG. 3 is a right side view;

FIG. 4 is a left side view;

FIG. 5 is a top view, the bottom view appearing the same; and,

FIG. 6 is a rear view. 

The ornamental design for a cake of soap, as shown. 